This research analysed examples of refurbished traditional Japanese timber houses according to the level of transformations made to spatial components that changes to walls and ceilings before and after refurbishing. Firstly wall composition patterns were classified into six categories according to format changes and wall changes. Secondly ceiling composition patterns were divided into categories according to the existence of structural expression and whether an upper floor was used in each room. In conclusion, among these patterns combinations, eight typical patterns were extracted, and it was clarified the spatial characteristics from the composition patterns of internal spaces.
